xref: /illumos-gate/usr/src/uts/common/os/kdi.c (revision 75d94465)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 /*
22  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #include <sys/cpuvar.h>
27 #include <sys/kdi_impl.h>
28 #include <sys/reboot.h>
29 #include <sys/errno.h>
30 #include <sys/atomic.h>
31 #include <sys/kmem.h>
32 
33 kdi_debugvec_t	*kdi_dvec;
34 struct modctl	*kdi_dmods;
35 
36 static kdi_dtrace_state_t kdi_dtrace_state = KDI_DTSTATE_IDLE;
37 
38 void
kdi_dvec_vmready(void)39 kdi_dvec_vmready(void)
40 {
41 	kdi_dvec->dv_kctl_vmready();
42 	kdi_dvec->dv_vmready();
43 }
44 
45 void
kdi_dvec_memavail(void)46 kdi_dvec_memavail(void)
47 {
48 	/*
49 	 * The driver will allocate more memory (if requested), and will call
50 	 * dv_memavail itself.
51 	 */
52 	kdi_dvec->dv_kctl_memavail();
53 }
54 
55 #if defined(__x86)
56 void
kdi_dvec_handle_fault(greg_t trapno,greg_t pc,greg_t sp,int cpuid)57 kdi_dvec_handle_fault(greg_t trapno, greg_t pc, greg_t sp, int cpuid)
58 {
59 	kdi_dvec->dv_handle_fault(trapno, pc, sp, cpuid);
60 }
61 #endif
62 
63 #if defined(__sparc)
64 /*
65  * Called on the CPU being initialized
66  */
67 void
kdi_dvec_cpu_init(struct cpu * cp)68 kdi_dvec_cpu_init(struct cpu *cp)
69 {
70 	kdi_dvec->dv_kctl_cpu_init();
71 	kdi_dvec->dv_cpu_init(cp);
72 }
73 
74 void
kdi_dvec_cpr_restart(void)75 kdi_dvec_cpr_restart(void)
76 {
77 	kdi_dvec->dv_kctl_cpu_init();
78 	kdi_dvec->dv_cpr_restart();
79 }
80 #endif	/* __sparc */
81 
82 void
kdi_dvec_modavail(void)83 kdi_dvec_modavail(void)
84 {
85 	kdi_dvec->dv_kctl_modavail();
86 }
87 
88 void
kdi_dvec_thravail(void)89 kdi_dvec_thravail(void)
90 {
91 	kdi_dvec->dv_kctl_thravail();
92 }
93 
94 void
kdi_dvec_mod_loaded(struct modctl * modp)95 kdi_dvec_mod_loaded(struct modctl *modp)
96 {
97 	kdi_dvec->dv_mod_loaded(modp);
98 }
99 
100 void
kdi_dvec_mod_unloading(struct modctl * modp)101 kdi_dvec_mod_unloading(struct modctl *modp)
102 {
103 	kdi_dvec->dv_mod_unloading(modp);
104 }
105 
106 kdi_dtrace_state_t
kdi_dtrace_get_state(void)107 kdi_dtrace_get_state(void)
108 {
109 	return (kdi_dtrace_state);
110 }
111 
112 int
kdi_dtrace_set(kdi_dtrace_set_t transition)113 kdi_dtrace_set(kdi_dtrace_set_t transition)
114 {
115 	kdi_dtrace_state_t new, cur;
116 
117 	do {
118 		cur = kdi_dtrace_state;
119 
120 		switch (transition) {
121 		case KDI_DTSET_DTRACE_ACTIVATE:
122 			if (cur == KDI_DTSTATE_KMDB_BPT_ACTIVE)
123 				return (EBUSY);
124 			if (cur == KDI_DTSTATE_DTRACE_ACTIVE)
125 				return (0);
126 			new = KDI_DTSTATE_DTRACE_ACTIVE;
127 			break;
128 		case KDI_DTSET_DTRACE_DEACTIVATE:
129 			if (cur == KDI_DTSTATE_KMDB_BPT_ACTIVE)
130 				return (EBUSY);
131 			if (cur == KDI_DTSTATE_IDLE)
132 				return (0);
133 			new = KDI_DTSTATE_IDLE;
134 			break;
135 		case KDI_DTSET_KMDB_BPT_ACTIVATE:
136 			if (cur == KDI_DTSTATE_DTRACE_ACTIVE)
137 				return (EBUSY);
138 			if (cur == KDI_DTSTATE_KMDB_BPT_ACTIVE)
139 				return (0);
140 			new = KDI_DTSTATE_KMDB_BPT_ACTIVE;
141 			break;
142 		case KDI_DTSET_KMDB_BPT_DEACTIVATE:
143 			if (cur == KDI_DTSTATE_DTRACE_ACTIVE)
144 				return (EBUSY);
145 			if (cur == KDI_DTSTATE_IDLE)
146 				return (0);
147 			new = KDI_DTSTATE_IDLE;
148 			break;
149 		default:
150 			return (EINVAL);
151 		}
152 	} while (atomic_cas_32((uint_t *)&kdi_dtrace_state, cur, new) != cur);
153 
154 	return (0);
155 }
156